Reachable Assertion Vulnerability in Rouille Product by Rouille Team
CVE-2026-66754

8.2HIGH

Key Information:

Vendor

Tomaka

Status
Rouille
Vendor
CVE Published:
28 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-66754?

Rouille versions 0.1.6 through 3.6.2 contain a reachable assertion vulnerability in the Request::remove_prefix function. This flaw enables remote attackers to exploit specific characteristics in crafted percent-encoded URLs, leading to server crashes. When a request is made with a decoded path that aligns with a predefined prefix while the corresponding raw percent-encoded path does not match, it triggers an assertion failure. Depending on the panic configuration of the server, this may result in a 500 internal server error or a complete termination of the server process. The potential impacts underscore the importance of addressing this vulnerability promptly to safeguard server integrity.

Affected Version(s)

rouille 0.1.6 <= 3.6.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-66754 - Proof of Concept

References

https://github.com/theopaid/Remote-Denial-of-Service-via-...
technical-descriptionexploit
https://www.vulncheck.com/advisories/rouille-reachable-as...
third-party-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Theodosis Paidakis
.